文献类型：期刊文献

英文题名：Recycling coral waste into eco-friendly UHPC: Mechanical strength, microstructure, and environmental benefits

作者：He, Zhi-hai[1,2];Shen, Meng-lu[1];Shi, Jin-yan[1,3];Yalcinkaya, Caglar[4];Du, Shi-gui[5];Yuan, Qiang[3]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[4]Dokuz Eylul Univ, Dept Civil Engn, Izmir, Turkey;[5]Ningbo Univ, Sch Civil & Environm Engn, Ningbo 315211, Peoples R China

年份：2022

卷号：836

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000806781400012)、、EI(收录号：20221912081091)、Scopus(收录号：2-s2.0-85129523646)、WOS

基金：Acknowledgments The authors would like to acknowledge the Natural Science Foundation of Zhejiang Province (Grant No. LY20E020006) , the International Scientific and Technological Cooperation Project of Shaoxing University (Grant No. 2019LGGH1009) and National Natural Science Foundation of China (Grant No. 51602198) for their financial support to the work present in this paper.

语种：英文

外文关键词：UHPC; Coral waste; Sustainability; Microstructure; Nanoindentation

外文摘要：On islands far away from the mainland, the raw materials for concrete production are often more difficult to obtain. Converting the coral waste generated during the island construction process into a marine ultra-high performance concrete (UHPC) mixture is an eco-friendly strategy. Coral powder (CP) is used to partially replace cement and silica fume (SF), and its mechanical strength, microstructure and environmental benefits are evaluated. Results show that using a small amount of CP (5%) to replace cement can improve the mechanical properties of UHPC, but the strength of UHPC decreases with the further increase of CP content. From the perspective of nanoindentation test, an appropriate amount of CP refines the pore structure of the UHPC matrix and increases the content of C-S-H, especially the proportion of high-density C-S-H. When 15% of SF is replaced by CP (SF15), the strength of UHPC decreases due to the decrease of C-S-H phase and the deterioration of microstructure. In terms of the width of the interface transition zone, the width of the C5 sample (CP replace 5% cement) is decreased by 16.7% compared with the control group, while the width of the SF15 group is increased by 38.9%. Compared with conventional UHPC, CP-based UHPC has lower carbon emission and non-renewable energy consumption, which effectively utilizes waste and promotes sustainability.